Machine for molding oval or other shapes from plastic material



he'e-ns-Sheet 1.

(No Model.)

. v as M. E. HUNTER & JQO. CLARK. MACHINE FOR MOLDING OVAL OR OTHER SHAPES PROM PLASTIC MATERIAL.

No. 492,206. Patgnted Feb; 21, 1893;

. 5 E .wmi. E KR f\ vw v p WQRII WW4 f fif \A/IT M55555. 9M 0' W 0 3 sheeta -s'he'et- 2. M. E. HUNTER 8% J. O. CLARK. MACHINE FOR MOLDING OVAL OR OTHER SHAPES FROM PLASTIC (No Model.)

MATERIAL.

No. 492,206. Patented Feb. 21, 1893..

I rlll'fill'flll'lllll!ffllllllllllV'Illlllllllfflfllfl/ WITNESS Wu QM 9/1970 1 DELPHIA, PENNSYLVANIA.

To all whom it may concern:

Be it known that we, MARSHALL E. HUNTER and OSEPH O. CLARK, of Boston, in the county I of Sufiollg'State of Massachusetts, citizens of 5 the United States, have invented a new and useful Improvement in Machines for Molding Oval and other Shapes from Plastic Material, of which the following isa full, clear, and exact description, reference being had to the ac- IO companying drawings, forming a part.- of this specification, in explaining its nature. I The invention relates to a machine for molding oval and other shapes from plastic and formative material, and it is represented as I 5 embodied in a'lna'chine having two cylinders adapted to be rotated in unison, one of which bears a series of male dies arranged in hori-.

of which bears a series of female dies arranged 2c in the same order upon it as are the male dies 'zupon the other cylinder, and so that each one shall register with. its corresponding male die as. the two cylinders are rotated. There is used in connection with these rotating dies or "es-forms means for presenting to them the plastic material in the form of sheets; also means for ejecting or removing thev formed shapes from the female dies, and for removing them from the machine; also means for stripping 0 from the male dies any of the formed shapes which may have adhered to them; also for re- {moving from the male dies cylinder the waste stri pier-that from which the shapes have been removed by the action of the dies. r The invention further relates to various features of construction and organization ,.all of WhlCllWill hereinafter be mentioned. -We re-. for particularly, however, at this point to the ,ejector ormeans for ejecting the formed material from the female dies, andthemanner of:- p "mounting male-dies in their holding cylinder. r ..The first comprises a flexible or elastic band .l arranged to-run between the male and female dies, and as they come together to be, by the ,5 maledies and .the' material from-which the I form is"made','pn shed into the'cavity-of...t he female dies during the molding operatiomand to eitherform the bottom of, said 'diesfor rest; .upon a. formed bottom-Sandhponthcrenioval'i of the dies'to draw', pulLor e1 ct fmm thoffe' f UNITED STATES MARSHALL'E. HUNTER AND JOSEPH o.

ASSIGNORS, BY MEsNEAssIeNMENTs, TO J. HENRY MITCHELL, on PHIL MACHINE FOR MOLDING'QVAL OR OTHER SHAPES FROM PLASTIC MATERIAL.

SPECIFICATION forming part of Letters Patent No. 492,206, dated February 21, 1893.- v Q Application filed February 4, 1892- Serial ll'o. 420,288. (No model.)

zontal or other lines thereon, and the other slides heldi'byth'e:framesajndtar ear z gether-to berotated simultaneously;and the CLARK, OF BOSTON, MASSACHUSETTS,"

male dies the formed shapes. It-isedesirable to construct the male dies so'that they may.- be readily centered in vtheirholding cylinder' inrelation to the femaledies, and also'read ily removedfromit. And this is accomplished 5 by drilling l olesin the cylinder andmaking a the dies with spindles having'a tapering form r from the base, which is innermost outward to the edge of the cylinder,thediefbein'gon 1 top of the apex and preferably integialwith' 6o h the spindle. This spindle isr'placed-inits,cy{-: a lindrical hole,- and having been-celi-teredin relation t'o the female die is'then lock ed -in place by solder poured into its-cavity abo'utj the. (30110; We would not, h'oweveificonfinekog ourselves to this specialmeans'of lioldingthe Referring tdthe drawingsiFigure 1 is af view in vertical central-sectioaofiour inven f '5 tion embodied in a machine; Fig:'-2.is a ."de-"w7otailed view of a section of-"the gearing cone V necting the rolls. Fig. 3 isa detail view,- en- 1arged,of asection of the cylinders,d ies ejector and formative material; showing the 'posi-v tion of thediesfdzc. at'the end-i of theirfo'rm ing action Fig. 41s aviewin vertical section-' of the machine fromsidetosidetlFig: dig-1's a; view in perspective, enlarged, io'frthe nrale'v die stripper; Fig. 6 is'a' view in perspective enlarged of amale die; Fig. Z.v is aidetai l lo view enlarged of "a section of the lower cylinder, showing a slight modification. Fi'gf8 a detail view. representing the fiexiblere e i'n'g band as forming the'bottoms. of lie fee male dies; Fig. 9 represents a changf relationof the supportswherebytheejee g bandis also made to serveas-acarrying belt: A, is the frame of thelnachine. M B, isthelower or nialefdie' holdingcylin der; (leis the upper or female die holding cylinder; -.-Theyjarer-iilounted I in fblocli's or upperone is-"made vertically-adjustable.in re ranged..-in arly;desiredbrd eu p n- .the gcylin id'er. .Biljfilldf theffeiiialefdies. -ai'e arranged .:u nithoii'"'ylind rij aeh to mt y anyconfiguration or shape desired, and we have represented them as having a suitable I of the-entraucefof the male die.

formation for making a circular tablet of oval'shape in cross section, something likean oyster-cracker or a common form of medicinal tablet. In the form shown the cavity of the female die is sufiiciently large to permit The female dies are represented as driven or otherwise secured in registering holes in the female die cylinder, and they are made of circular pieces ofv steel or other suitable material of a shape to drive or fi't their circular holding holes. They have the female form modeled or shaped in'their outer ends.

The male dies are represented as having the tapering spindles 1) extending from the circular inner end 1) outward, the die proper vbeing at the outer end of the spindle. The round section b fits the holding hole of the male die cylinder, but not: sufiieie'ntly tight to prevent the-spindle from being canted a little in it,.and when the male die is brought into proper registration with the female die it is'rigidlyiocked in that position by solder or Babbitt metal poured in the cavity about the cone. This holds the diescentered, yet, at the same time permits them to be readily driven from the holes when desired, for purpose of renewal or for other reason; We .do not confine ourselves, however, to this particular manner of holding the male dies in the male die cylinder,

The plastic orformative material prefer-- ably is presented to the dies in the form of a.

sheet of any desired width and in the drawings 1 D, representsthissheet'; It is represented as fed to the dies bya feeding belt E, the innor. end. only of which is shown running over the drum e. dies 1s a table e over which the material is fed or drawn to or by'the dies. Arrangedbe tween the two die cylinders, and rotatingn therewith, is the ej e'ctor band F. In the draw; in gs it 18 shown as running around the'female die cylinder from the delivery sideof the-aha:

" female. die cylinder separatesthe female die from the male die and also drawsthe female chine andyas ,turningiwith the dies; The band may be elastic, formative or flexible. Its object primarily is -to eject or drawthe formed article from the female die after it has left or -become separated from ,.the maledie. It should be sufliciently formative oryielding to be pushed into the 'cavity'of the female die by the-material and male die, and themale.

die and its edges should be so shaped asgto permit the band thus being :,pressed into the,

femalediefiwithont injury to'i t.

In use, the material having been forced by, the maleidieand with the'band into the female die cavity, the further rotation of the "'die from the ejecting band, so that the formed article in the femaledie. is by the band drawn or ejected from the die. Where the band is elastic and flexible rather than flexiblealone,

the operation of the band is correspondingly ends of these scrapers are no thicker the that the band F,

I which. air pressed into it by Betweenthe feed belt E and the may enter .ing away of the female die-from the band.

In Fig. 8 we have shown a detail view of the female die and male'die and band acting as automatically from the, dies,

modified. The ejected forms are dropped from the band upon the carrying belt G running over the drum 9 by which they are removed to a suitable receptacle. Occasionally the formed or molded shapes will adhere to the male dies, and to remove them therefrom upon the carrying belt G, we have arranged below the male die cylinder the stripper plate I'I, having upon its face the stripper h, somewhat inclined to the plate II, and having in line with the dies the inward curved sections the molded forms which are presented by the male dies toward them. This prevents the form of the molded shapes from being changed in the act of stripping them from the dies.

h, which are of the shape of the'portion of To remove the waste material from the cylinder B there are formed in the cylinder grooves m between the rows of dies, and into are extended from the these grooves there framethe'scrapersM,preferablyyielding. The

depth of the grooves, and as the cylinder B revolves with the material 1) upon it, the material is switched or turned from the cylinder by running upon the scrapers, see Fig. 1. It is then turned on to the short bed 'mfrom which it runs on to a carrying belt m than the The female dies 0, may be so constructed may form the bottom of the die. See Fig. 8. tion the band F, is

cavity. In this event the female dies maybe simply cylinders; that is, the bottom of the die die, however, must have a vent hole 'n by male die may escape and through which, it to prevent suction upon the. draw;

the bottom'of the'female die.

male dies,

That is, in the moldingracpressed into the female die cavity and forms the moldin'gbottom of the the band. Each female the; band and i We would say that while we haveshown- .the femalerdies asmounted above the maledies, that their position may be reversed; tl 1a t is the male dies may bemounted over the fe and with such an organization the femaledie and theejectorband F, are made to perform two additional functions, first to as .sist in the feeding of the material strip from v; the table eto the dies.

the place of the belt. G, complete shapes fromthe dies.,

and, second, to take in transferring the;

In use .the materlal-islformed into sheets. 1

and ,fedto the dies which. are 'rotatedtogether.

at any desired speed. Thecoming together of thedieseremoves the material which is fed between: them in suflicient quantities for.

shapes,-which are immediately. r3o

forming the producedby the further coming together of.

the-dies; Immediateseparation ofthe dies, follows and .the ejection of the formed shapes Y takes place,-th e.formed shapes being removed as specified, and,

the male dies being stripped of any. of the material which may adhere to them, the waste material being removed from the under die and returned by a belt to a position to be again made up into full sheets.

A machine having substantially the features of this invention may be used for the shaping or producing of forms of any desired shape from practically all kinds of plastic or formative material.

Having thus fully described our invention,

. we claim and desire to secure by Letters Patbottom varying in accordance with the thickent of the United States- 1. In a machine for molding shapes from plastic material the combination of two cylinders adapted to be rotated in unison,one of which carries female dies in any desired'form or arrangement, and theother of which carries male dies of the arrangement of the female dies, and the band B arranged between the cylinder for conjoint action with the dies, substantially as and for the purposes described.

2. In a machine for molding plastic shapes the combination of ainale die and a female die movable in relation to each'other and an elas-.

tic or flexible band or strip of material arranged between the two dies and forced into the cavity of one die with the material by the other die, and upon the separation of the dies removed from said first named die to eject the formed shape therefrom, substantially as described. 3. In a machine for making shapes of formative material, the combination of a male die and a female die, with a flexible or yielding band adapted and arranged to for'm the bottom of the female die, the concavity of said ness of the material forced therein by the male die, substantially as described.

4. The combination in a machine for mold ing shapes from plastic material, of a cylin-'v der carrying male dies, a cylinder carrying female dies which rotate in unison and engage with the male dies, a flexible or elastic band F a material carrying band E, and atable e between the-band and the converging point of the dies, as and for the purposes described.

'5. In a machine of the character herein specified, the combination of a cylinder 13,

' having grooves 'ml therein, the male die being supported by said cylinder; the carrying band G, the strippers H and scrapers M arranged to enter the grooves m, substantially as shown and described.

6. The combination in a machine of the.

character specified of the cylinderB, the male dies b supported thereby, and a stripper having a stripping plate, the-stripping edge of which is shaped to the configuration of the edge of the shaped article which is brought in contact therewith by the male die as and for the purposes described.

7. The combination in a machine of the character specified of the cylinder B, having dies and grooves 111. the cylinder having d1es to engage with those of the cylinder and the scrapers M to enter the grooves m of the cylinder B, as and for the purposes described.

8. A die having a conical-spindle n combination with a holder for said die provided with a cavity in which the die may be turned in either direction, and centrally secured by and for the purposes specified- 9. A female die, provided with a vent holeat ornear its bottom, a flexible or elastic band over the mouth of the female die, and a male running metal about theconieal spindle, as g die adapted to enter the female die, the whole. v

combined and arranged to operate, substantially as shown and described.

10. The combination of a die cylinder carying male sections of dies, a cylinder carrying female sections of dies to engage the male sections as they are rotated, and the band F,

running between the two cylinders, the said cylindersbeing so arranged that the said band acts as an ejector and carrier, as and for the i purposes described.

ector band-F; r00 

